AutoCodes – Generic – B229A

B229A Code - Occupant Classification System Contamination

Quick Answer

The Occupant Classification Sensor (OCS) system is used to classify the front passenger seat occupant in the event of a deployable impact. Common causes include A foreign object within an occupant classification sensor rail, Faulty Occupant Classification Sensor (OCS) System Component. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: B229A indicates Occupant Classification System Contamination.
Common causes: Common causes include A foreign object within an occupant classification sensor rail, Faulty Occupant Classification Sensor (OCS) System Component.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 1,398

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Oct 31, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B229A Description

The Occupant Classification Sensor (OCS) system is used to classify the front passenger seat occupant in the event of a deployable impact.
The Occupant Classification Sensor Module (OCSM) monitors the 2 OCS rails (weight sensors) and circuity for faults. If the OCSM detects an object within the OCS rails, it will store DTC B229A in memory and send a message to the restraints control module (RCM) which sends a message to the instrument cluster (IC) module to illuminates the air bag indicator.

OBDII Code B229A - Occupant Classification System Contamination - AutoCodes.com — B229A Code - Occupant Classification System Contamination

What does this mean?

What are the Possible Causes of the DTC B229A?

A foreign object within an occupant classification sensor rail
Faulty Occupant Classification Sensor (OCS) System Component

How to Fix the DTC B229A?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B229A code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B229A code?

Need more information on how to fix the B229A code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B229A code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B229A Ford — Occupant Classification System Contamination
B229A Jaguar — Occupant Classification System Contamination
B229A Lincoln — Occupant Classification System Contamination
B229A Mazda — Occupant Classification System Contamination
B229A Mercury — Occupant Classification System Contamination

Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service

Never probe the electrical connectors on air bag, side air curtain modules or seat belts.
Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors.
Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 minutes. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.

Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B229A Code

1. What are common symptoms of OBDII code B229A (Occupant Classification System Contamination)?

- Common symptoms include the airbag warning light being illuminated on the dashboard and potential issues with the proper functioning of the vehicle's airbag system.

2. What can cause the OBDII code B229A to trigger in the Occupant Classification System?

- This code is typically triggered by contamination on the sensors or components of the Occupant Classification System, such as dirt, liquids, or foreign objects interfering with the system's operation.

3. How can I diagnose the issue related to OBDII code B229A?

- Diagnosis involves using a professional OBDII scanner to retrieve the code, followed by inspecting the components of the Occupant Classification System for any visible signs of contamination or damage.

4. Can I repair OBDII code B229A myself?

- While it is possible to address some contamination issues yourself by cleaning the affected components, it is recommended to consult a professional mechanic for a thorough inspection and proper repair to ensure the safety of the airbag system.

5. Are there any temporary fixes for OBDII code B229A?

- Temporary fixes such as clearing the code with an OBDII scanner may temporarily turn off the warning light, but the underlying issue of contamination should be addressed promptly to ensure the proper functioning of the airbag system.

6. What are the risks of ignoring OBDII code B229A?

- Ignoring this code can lead to potential malfunctions in the vehicle's airbag system, compromising occupant safety in the event of a collision.

7. How much does it typically cost to repair OBDII code B229A?

- The cost of repair can vary depending on the extent of contamination and any necessary replacement parts. It is advisable to get a professional assessment to determine the exact cost.

8. Is it safe to drive with OBDII code B229A present?

- It is not recommended to drive with this code present, as it indicates a potential issue with the airbag system that could affect its operation in the event of an accident.

9. How long does it take to repair OBDII code B229A?

- The repair time can vary depending on the extent of contamination and the specific components that need attention. A professional mechanic can provide a more accurate estimate based on the inspection.

10. Can OBDII code B229A affect other systems in the vehicle?

- While this code specifically relates to the Occupant Classification System, it is crucial to address it promptly to prevent any potential impacts on other safety systems, such as the airbag deployment system.